On Tue, 27 Jul 2021 16:04:42 +0200, Geert Uytterhoeven wrote: > The Holtek HT16K33 LED controller is not only used for driving > dot-matrix displays, but also for driving segment displays. > > Document compatible values for the Adafruit 7-segment[1] and > 14-segment[2] FeatherWing expansion boards with red displays. According > to the schematics, all other Adafruit 7-segment and 14-segment display > backpack and FeatherWing expansion boards (including bare boards and > boards fitted with displays) are compatible with these two boards. > > [1] https://www.adafruit.com/product/3108 > [2] https://www.adafruit.com/product/3130 > > Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> > --- > v4: > - Combine compatible values for 7/14 segment displays into an enum, > > v3: > - Drop color property, > > v2: > - Fix type of color to uint32, > - "refresh-rate-hz" is still required for dot-matrix displays. > > Alternatives I considered: > 1. Document the attached display type in a child node. > I.e. specify segment type, number of characters, and wiring. > Especially the latter would become really complex, due to the sheer > amount of possible wiring combinations. > Using this method, you also loose the ability to just connect a > display to an i2c bus, and instantiate the device from sysfs, > without using DT: > > echo adafruit,3130 0x70 > /sys/class/i2c/i2c-adapter/.../new_device > > 2. Document all Adafruit 7-segment and 14-segment display backpack and > FeatherWing expansion boards. > This would lead to a myriad of compatible values: > > - items: > - enum: > - adafruit,878 # 0.56" 4-Digit 7-Segment Display Backpack (Red) > - adafruit,879 # 0.56" 4-Digit 7-Segment Display Backpack (Yellow) > - adafruit,880 # 0.56" 4-Digit 7-Segment Display Backpack (Green) > - adafruit,881 # 0.56" 4-Digit 7-Segment Display Backpack (Blue) > - adafruit,1002 # 0.56" 4-Digit 7-Segment Display Backpack (White) > - const: adafruit,877 # 0.56" 4-Digit 7-Segment Backpack > - const: holtek,ht16k33 > > - items: > - enum: > - adafruit,1268 # 1.2" 4-Digit 7-Segment Display Backpack (Green) > - adafruit,1269 # 1.2" 4-Digit 7-Segment Display Backpack (Yellow) > - adafruit,1270 # 1.2" 4-Digit 7-Segment Display Backpack (Red) > - const: adafruit,1271 # 1.2" 4-Digit 7-Segment Backpack > - const: holtek,ht16k33 > > - items: > - enum: > - adafruit,1911 # 0.54" Quad Alphanumeric Display Backpack (Red) > - adafruit,1912 # 0.54" Quad Alphanumeric Display Backpack (Blue) > - adafruit,2157 # 0.54" Quad Alphanumeric Display Backpack (White) > - adafruit,2158 # 0.54" Quad Alphanumeric Display Backpack (Yellow) > - adafruit,2159 # 0.54" Quad Alphanumeric Display Backpack (Yellow-Green) > - adafruit,2160 # 0.54" Quad Alphanumeric Display Backpack (Green) > - const: adafruit,1910 # 0.54" Quad 14-segment Alphanumeric Backpack > - const: holtek,ht16k33 > > - items: > - enum: > - adafruit,3106 # 0.56" 4-Digit 7-Segment FeatherWing Display (Blue) > - adafruit,3107 # 0.56" 4-Digit 7-Segment FeatherWing Display (Green) > - adafruit,3108 # 0.56" 4-Digit 7-Segment FeatherWing Display (Red) > - adafruit,3109 # 0.56" 4-Digit 7-Segment FeatherWing Display (White) > - adafruit,3110 # 0.56" 4-Digit 7-Segment FeatherWing Display (Yellow) > - const: adafruit,3088 # 0.56" 4-Digit 7-Segment FeatherWing > - const: holtek,ht16k33 > > - items: > - enum: > - adafruit,3127 # 0.54" Quad Alphanumeric FeatherWing Display (White) > - adafruit,3128 # 0.54" Quad Alphanumeric FeatherWing Display (Blue) > - adafruit,3129 # 0.54" Quad Alphanumeric FeatherWing Display (Green) > - adafruit,3130 # 0.54" Quad Alphanumeric FeatherWing Display (Red) > - adafruit,3131 # 0.54" Quad Alphanumeric FeatherWing Display (Yellow) > - adafruit,3132 # 0.54" Quad Alphanumeric FeatherWing Display (Yellow-Green) > - const: adafruit,3089 # 0.54" Quad 14-segment Alphanumeric FeatherWing > - const: holtek,ht16k33 > --- > .../bindings/auxdisplay/holtek,ht16k33.yaml | 20 ++++++++++++++++--- > 1 file changed, 17 insertions(+), 3 deletions(-) > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
